Melatonin, DHEA, Vitamin D, these are all natural elements of the human body and you can take as much as you want from the health good store and be a natural human being. Insane, unnatural doses of vitamin C, much greater than would ever naturally exist in the human body are recommended all the time. Given that testosterone is a natural element of the human body, you can take as much as you want and be natural. Just no Tren!!!!!! That's cheating!!!!